<html>
<head>
<link rel="stylesheet" href="bootstrap.css" />
<script>
function kk() {
   document.getElementById("button1").setAttribute("class","btn btn-danger");
}
</script>
</head>
<body>
<!--div class="container-fluid maindiv">
<div class="row-fluid">
<div class "span4">
<input type="button" class="btn btn-primary btn-large" id="button1" value="Mina" onclick="kk()"/>
</div>
<div class "span8">
<input type="button" class="btn btn-primary btn-large" id="button1" value="Mina" onclick="kk()"/>
</div>
</div>
</div-->

<div class="container-fluid">
      <div class="row-fluid">
        <div class="span3" style="background-color: #f00">
         Mina Mina Mina
        </div><!--/span-->
        <div class="span9" style="background-color: #00f">
         Christine Christine
        </div><!--/span-->
      </div><!--/row-->
      </div>
</body>

</html>